The way you review VODs can give you different perspectives and it is important to know all the different methods. You can study as much as you want before the test date, but it is up to you to prepare yourself for the test. Watching games is analogous to studying for a test while playing the game is taking that test. You can pause and rewind when watching games, so if there are areas of importance you are able to review them as much as you please. You may be able to note your mistakes during the game, but you can easily forget them as the game progresses.
If you only constantly play the game without looking back at your mistakes, then it is extremely easy to build bad habits and eventually plateau at a certain skill level. It is important to be able to identify your mistakes since you do not want to build poor habits and you want to be mindful of what you are doing during the game. Watching VODs also prepares you to play the game since you may be able to learn a new mechanic or new way to play a matchup that you would not have known beforehand. VODs also allow you to see different perspectives and matchups that you may not have a great understanding of.
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Watching professional games allows you to see some of the highest levels of gameplay and see what the best players are doing to win. Watching games can allow you to find habits that good players make or allow you to see the mistakes you are making during a game. Playing the game is the only way to improve your mechanics and get live action practice against other people at a similar skill level. Two major ways you can improve your gameplay are playing the game and watching games. There are only so many effective ways to improve your gameplay.